Bending device for clasping machines



Oct. 24, 1950 5, FERDUS I 2,527,123

BENDING nzzvzcz: FOR CLASPING MACHINES Filed Nov. 5,- 1946 2 Sheet-Shet 1 INVENTOR:

ATTORNEYS.

Oct. 24, 1950 Filed Nov. 5, 1946 2 Sheets-Sheet 2 INVENTOR.

ATTORNEYS.

Patented Oct. 24, 1950 UNITED STATES PATENT OFFICE- Stanislav Ferdus, Zlin, Czechoslovakia, assignor to Bata, narodni podnik, Zlin, Czechoslovakia Application November. 5, 1946, Serial No. 707,958 In Germany March 4, 1941 Section 1, Public Law 690', August 8, 1946 Patent expires March 4, 1961 Claims. 1

This invention relates to clasping machines and particularly to the bending device by means of which the material used, such as wire or the like, is subjected to a bending operation 'to produce wire or similar clasps for clasping machines used in the manufacture of shoes,'of paper board. articles and of other articles of various kinds.

The known clasping machines comprise in.

combination a feeding devicefor the wire of which the clasps are to be formed, a wire shearing device, a bending device in which the severed length of wire is bent to'the shape of clasp and a hammering device by means of which the clasp thus produced is driveninto the material of the treated article.

The bending device, to which a wire piece of suitable length is fed consists in the known machines of a former over which the wire is bent to the required shape by a special die. Before the clasp thus shaped is driven into the material it is necessary to remove the formerfrom the path of the clasp and of the hammer by means of which the clasps are driven into the material, since up to this moment the former assumes a position under the clasp and for this reason would be an obstacle preventing the clasp from being effectively driven into the material. This removal of the former is effected by a special mechanism. Thus the bending device itself of the known clasping machines requires two control mechanisms, one to control the die and the other to remove the former from the path of the clasp and of the hammer during the driving of the clasp into the material.

For this reason the bending device in known clasping machines is of rather complicated construction and moreover shows the drawback that the die is subjected to wear and must be replaced by a new one after a short time, as in order to enable shorter clasps to be produced too, the wall of the die can not be given more than the thickness just necessary.

As compared with the known constructions the machine in accordance with the invention has a bending device of far simpler construction, particularly in respect of the driving arrangement, while the new bending device is much more resistant to wear.

Inaccordance with the present invention, the bending device comprises two members which are provided with grooves for locating" the wire to be bent and are movable relative to eachother in such a manner that in the initial position the grooves of both members are'aligned in one and the same plane, while in; the final position-the grooves are relatively displaced one in respect 2 of the other so as to form a guiding channel for driving in the clasp which has been shaped by the transition of the two members from their initial to their final-position.

This arrangement of the bending members has the advantage that they may be controlled by a single driving device, such as a spur wheel or a rack, so that the second driving device used in the machines of known construction becomes superfluous.

The new bending device can be arragned without any difficulty between the shearing and driving-in devices of the clasping machines of known construction, so that a clasping machine provided with a bending device in accordance with the invention has all the other characteristics of the existing clasping machines, e. g. allows of changes in the length of the cut pieces of wire as hereinbefore, while an additional advantage ofv the invention results therefrom that in the construction of the new bending device thepossibility of producing small clasps on the same m'a-- chine needs not be particularly considered.

Further advantages and features of the invention are disclosed in the following description with reference to the appendant drawings, in

which Figs. 1, 2 and 3 show schematically the bending device in its initial position, during the bending operation and in its final position, respectively;

Fig. 4 is a schematic view of the clasping device;

Fig. 5 shows a further example of the bending device;

Figs. 6 and 7 show in elevation and in plan View, respectively, the device shown in Fig. 5, before the bending operation has been initiated;

Figs. 8 and 9 show in elevation and in plan view the same device as in Figs. 6 and 7, but upon termination of the shaping of a clasp; and

Fig. 10 is a perspective view of a protector for Y the conical bending members.

The bending device in accordance with the present invention comprises two bending members, for instance two conical bodies I, I, whichare provided on their surfaces with grooves 2, 2' and may be rotated on pivot pins 3, 3 mounted fixedly in the framework of the machine. The conical bodies I, I have the same apex angle, which for the production of U-shaped clasps is degrees. The grooves 2, 2' extend from the bases of the cones towards their summits.

In theposition of the conical bodies I, I shown in Fig. I' asuitable length of wire 4 is inserted" 5, (Figs. 1 and 2) secured to the conical members, e. g. by means of screws 9, 9. The removable pieces 5, 5 are formed of very goodinaterial in order that the grooves 2, 2 may resist wear.

The wire 6 is fed from a wire supply by means of a feed device I (Fig. 4) of known construction to a wire guide 8 whose chamfered front part serves as one element of the shearing deviceof which the other element is constitutedby the, I

Before the" shearing knife (Figs. 1 and 2). wire 6 is cut, it is fed by the feed device 1 to a suitable distance beyond the lateral guide H under a retaining spring .12 whose purpose is to It should be understood that the above described embodiment of the bending device for producing clasps has not any limiting character, except as it may be limited by the claims. The details of the same may be carried out in a different manner without departing from the spirit of the invention as defined in the appendant claims. Thus for instance it is not absolutely necessary to employ bending members ofconical shape, the apex angle of the conical bodies, if used, needs not of necessity "be 90 degrees, the drive of the bending members needs not be performed by rack and teeth i" arranged on these members, etc.

prevent the wire length 4 fromfalling O'UtgQf'g the groove 2';or becoming displaced in:the same during the shearing operation (Fig. 4).

The rotation of the conical bodies I; l on the pivot pins 3, 3 is carried out, for instance, by means of teeth IS, IS which are provided on the bottom of the bodies and engage with a rack which may be driven from the driving source (not shown) of the machine in. any convenient;

manner, e. g. by means of a crank, an eccentric,

a cam or the like.

In order that during the operating movement of the bodies I, i, that is during the bending. operation, the wire length 4 may not fall away from the grooves, the framework of the machine has arranged therein a protector I5, Fig. 10, which is provided with cavities corresponding" to the shape of the conical bodies I, I and coy-"- ers closely these bodies in the region of move-1 ment of the grooves 2, 2..

The hammer l6 and guide I! (Fig. 4) are conventional parts of a clasping machine in the' same way as the'shearing and feed devices. These known elements are driven in the usual manner and therefore no detailed description of the same is necessary.

The bending device operates as follows: As it has been pointed out in the foregoing parts of this specification, the conical bodies I, I

assume at the beginning such a. position that' their grooves 2, 2' are aligned in one and the same plane (Fig.1). In this position the end of the wire 5 is introduced under the retaining spring 12 into the groove 2 in a manner known per se by means of the feed device I, the guide 8 and the lateral guide H (Fig. 4). After cutting of the wire 6 by means of the shearing device 8 and If) the severed wire length 4 assumes (Fig. 2) until they come to the final position 7 (Fig. 3) in which they are located opposite to each other in such a way that they form a channel A, the wire 4 having been bent by that time i into a clasp B. In this position the=bodies l', .I cease to rotate, the hammer I6 is inserted from and guide II, whereby the clasp is driven-into the material of the article under treatment. r

Another embodiment of the invention is shown by way of example in Figs. 5 to 9. The perspective view in Fig. 5 shows the discs l3, I8 deviated one in respect of the other, in order to facilitate the illustration, but in fact these discs are coaxial, as shown in Figs. 6 to 9.

The. device comprises two identical bending discs I8, 18 mounted on shafts l9, 19'. front face of the disc 18 in its part 20 is cut-at right angles to the axis of the disc, while in the other part 2| it is shaped helically (Fig. 5). In the portion which projects at most from the plane 20 there is formed a groove 22 whose axis passes-through the center of the circular front face of the disc l8. In'the same manner the disc [8 is provided with a groove 22, a fiat portion 20 cut at right angles to the axis of the disc and a helically shaped portion 2| (Fig. 5).

The shaft l9 carrying the disc I8 is mounted rotatably in a bearing 23 and is not axially movable, while the shaft 19' of the disc I8 is not only rotatable, but is also axially movable in its bearing. 23', the disc 18' being constantly urged I8" are caused to rotate relative to eachother in opposite directions, as shown by the arrows in Fig. 5, this rotation resulting in a sliding move-' ment of the helical surfaces 2|, 2| one upon the other, so that they force the disc 18' back against the action of the spring 24, thereby bending over the Wire 21. When the discs l8, l8 arrive to a position in which the grooves 22, 22 are located one'opposite to the other in such a way that they form a channel C (Figs. 8 and 9), the rotation of the discs is terminated. By this time the wire 21 has been bent into a clasp D, which by means of thehammer 25 is driven into the material of the article under treatment over the conventional guide 26 in a manner known per so.

What I claim is:

1 In a bending device for the production of U-shaped wire clasps in clasping machines, the provision of two complementary relatively rotatable bending members and clasp forming grooves on said members, the bending members and the grooves therein being disposed and movable with respect to each other in such a manner, that in the initial position thereof the grooves on the same are longitudinally aligned in one and the same plane while in the final position the-grooves assume positions parallel to and 0p- The posite each other and cooperate to form an open ended guiding channel for the clasp shaped by the rotation of the bending members from their initial to their final position,

2. In a bending device according to claim 1, the bending members being formed as conical bodies which are rotatable on pivot pins extending in the direction of the axes of the cones, the grooves on the bending members extending from the base of each conical body to the summit of the same.

3. In a bending device according to claim 2, means providing a conically concave guide surface complementary to and closely adjacent the conical bending bodies to retain the work in the grooves during the bending operation.

4. In a bending device according to claim 3, means providing a conically concave guide surface complementary to and closely adjacent the conical bending bodies to retain the work in the grooves during the bending operation.

5. In a bending device according to claim 4, means providing a conically concave guide surface complementary to and closely adjacent the conical bending bodies to retain the work in the grooves during the bending operation.

6. In a bending device according to claim 1, the bending members being formed as conical bodies which are rotatable on pivot pins extending in the direction of the axes of the cones, the grooves on the bending members extending from the base of each conical body to the summit of the same, and being provided in removable wear resisting pieces secured to the conical bending bodies.

7. In a bending device for the production of U-shaped wire clasps in clasping machines, the provision of two relatively movable conical bending bodies and clasp forming grooves on said bodies for the wire to be bent, the apex angles of the bending bodies being 90 degrees and the axes of these bodies extending at right angles to each other, the clasp forming grooves extending from the base of each conical body to the apex thereof and means for rotating said bodies from an initial position in which said grooves are disposed in longitudinal alinement in the same plane to a final position in which the grooves are disposed parallel to and opposite each other to define an open-ended channel for discharge of the clasp formed by the rotation from initial to final position.

8. In a bending device for the production of wire clasps in clasping machines, the provision of two relatively rotatable conical bending bodies, clasp forming grooves on said bodies for the wire to be bent, the clasp forming grooves extending from the base of each conical body to the apex thereof, means for rotating said bodies from an initial position in which said grooves are disposed in longitudinal alinement in the same plane to a final position in which the grooves are disposed parallel to and opposite each other to define an open-ended channel for discharge of the clasp formed by the rotation from initial to final position, a retaining spring adapted to retain the work piece in the grooves before the bending operation is initiated and a protector having guide surfaces complementary to and closely adjacent the conical bending bodies adapted to retain the work piece in the grooves during the bending operation.

9. In a bending device for the production of U-shaped wire clasps in clasping machines the provision of two complementary confronting coaxial relatively rotatable and axially shiftable bending discs and clasp forming grooves on the front faces of the discs, the grooves in each disc extending from adjacent the center radially to the circumference thereof and positioned in the initial position of the discs to extend in longitudinal alignment in the same plane and in the final position to be disposed parallel to and opposite each other and cooperate to form an open ended guiding channel for the clasp shaped by the rotation of the discs from their initial to their final position.

10. In a bending device for the production of U-shaped Wire clasps in clasping machines, the provision of two complementary relatively rotatable and axially shiftable bending discs and clasp forming grooves on the front faces of the discs, said front faces in one part being cut to a plane at right angles to the axes of the discs and in the other part being shaped into a helical surface, the grooves in each disc extending from adjacent the center radially to the circumference thereof and positioned in the initial position of the discs to extend in longitudinal alignment in the same plane and in the final position to be disposed parallel to and opposite each other and cooperate to form an open ended guiding channel for the clasp shaped by the rotation of the discs from their initial to their final position.

STANISLAV FERDUS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date Re. 8,306 I-Iill June 25, 1878 173,909 Rennard Feb. 22, 1876 243,683 Bestor July 5, 1881 1,267,845 Burt May 28, 1918 1,821,894 Otaka Sept. 1, 1931 1,941,166 Eaton Dec. 26, 1933 1,993,970 MacMurray Mar. 12, 1935 2,042,537 Liddell June 2, 1936 2,068,224 Blashill Jan. 19, 1937 FOREIGN PATENTS Number Country Date 352,698 Italy Sept. 20, 1937 482,204 France Dec, 5, 1916 

